When I was dx, the DSN said to add a correction dose of 1 unit of Apidra (rapid) if my BG before a meal was over 150mg/dL - that's 8.3 mmols - so that's what I've always done. Later on I added these two to my repertoire: if I'm higher than 13.0 I take a 2-unit correction; higher than 16.0 (gawd forbid!) a 3-unit correction.
I know that the "Using Insulin" authors and Gary Scheiner, etc. etc. stress the importance of working out your own personalised CDs (and when to apply them) with a whole ton of mind-numbing maths but, frankly, life's too short! I do languages, not numbers...
😱😛 I've tried and tested my CDs and they work.
I think the problem when first dx - certainly true for me - is the feeling that suddenly you have to write your own body's handbook: do this when this occurs, do that when that occurs. The to-do list can seem endless.
😱 And it can feel really overwhelming. It's only when I started taking baby steps that I was able to cope...and to this day, I have to be careful not to overdo it and end up in burnout mode.
Baby steps, Kaylz - you don't have to wear a nappy, btw.
😉